org.apache.hadoop.hdfs.server.common

类 GenerationStamp

java.lang.Object

org.apache.hadoop.hdfs.server.common.GenerationStamp

所有已实现的接口:

Comparable<GenerationStamp>, Writable, WritableComparable<GenerationStamp>

public class GenerationStamp
extends Object
implements WritableComparable<GenerationStamp>

A GenerationStamp is a Hadoop FS primitive, identified by a long.

字段概要

字段

限定符和类型	字段和说明
static long	FIRST_VALID_STAMP
static long	WILDCARD_STAMP

构造器概要

构造器

构造器和说明
GenerationStamp() Create a new instance, initialized to FIRST_VALID_STAMP.

方法概要

方法

限定符和类型	方法和说明
static int	compare(long x, long y)
int	compareTo(GenerationStamp that)
boolean	equals(Object o)
static boolean	equalsWithWildcard(long x, long y)
long	getStamp() Returns the current generation stamp
int	hashCode()
long	nextStamp() First increments the counter and then returns the stamp
void	readFields(DataInput in) Deserialize the fields of this object from in.
void	setStamp(long stamp) Sets the current generation stamp
void	write(DataOutput out) Serialize the fields of this object to out.

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

字段详细资料

WILDCARD_STAMP

public static final long WILDCARD_STAMP

另请参阅:

常量字段值

FIRST_VALID_STAMP

public static final long FIRST_VALID_STAMP

另请参阅:

常量字段值

构造器详细资料

GenerationStamp

public GenerationStamp()

Create a new instance, initialized to FIRST_VALID_STAMP.

方法详细资料

getStamp

public long getStamp()

Returns the current generation stamp

setStamp

public void setStamp(long stamp)

Sets the current generation stamp

nextStamp

public long nextStamp()

First increments the counter and then returns the stamp

write

public void write(DataOutput out)
           throws IOException

从接口复制的说明: Writable

Serialize the fields of this object to out.

指定者:

write 在接口中 Writable

参数:

out - DataOuput to serialize this object into.

抛出:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

从接口复制的说明: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

指定者:

readFields 在接口中 Writable

参数:

in - DataInput to deseriablize this object from.

抛出:

IOException

compare

public static int compare(long x,
          long y)

compareTo

public int compareTo(GenerationStamp that)

指定者:

compareTo 在接口中 Comparable<GenerationStamp>

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

equalsWithWildcard

public static boolean equalsWithWildcard(long x,
                         long y)

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object